The grand piano sounds great on it! The velocity could be a little better, you have to really pound it to get sound out. Horns aren't bad, drums are crap (on internal speakers).

I have not hooked it up to a system yet. One downside is headphones is the only audio out.

I also wish it had more storage, 3 or 4 songs is about all it holds.

All in all for a first time hobbyist keyboard, you can't do better in this range. As you go down in price, the sound quality drops considerably. This is a good one to stick with.